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9 papers · 2 filters
X-ray and Multiwavelength Insights into the Nature of Weak Emission-Line Quasars at Low Redshift
Jianfeng Wu, W. N. Brandt, Scott F. Anderson +5
(Abridged) We report on the X-ray and multiwavelength properties of 11 radio-quiet quasars with weak or no emission lines identified by the Sloan Digital Sky Survey (SDSS) with red…
Investigating MgII Absorption in Paired Quasar Sight-Lines
Jesse A. Rogerson, Patrick B. Hall
We test whether the Tinker & Chen model of MgII absorption due to the gaseous halo around a galaxy can reproduce absorption in quasar pairs (both lensed and physical) and lensed tr…
Direct Evidence for Termination of Obscured Star Formation by Radiatively Driven Outflows in Reddened QSOs
Duncan Farrah, Tanya Urrutia, Mark Lacy +9
We present optical to far-infrared photometry of 31 reddened QSOs that show evidence for radiatively driven outflows originating from AGN in their rest-frame UV spectra. We use the…
A Description of Quasar Variability Measured Using Repeated SDSS and POSS Imaging
Chelsea L. MacLeod, Zeljko Ivezic, Branimir Sesar +9
We provide a quantitative description and statistical interpretation of the optical continuum variability of quasars. The Sloan Digital Sky Survey (SDSS) has obtained repeated imag…
CIV Emission and the Ultraviolet through X-ray Spectral Energy Distribution of Radio-Quiet Quasars
Nicholas E. Kruczek, Gordon T. Richards, S. C. Gallagher +6
In the restframe UV, two of the parameters that best characterize the range of emission-line properties in quasar broad emission-line regions are the equivalent width and the blues…
Characterisation of Long Baseline Calibrators at 2.3 GHz
F. Hungwe, R. Ojha, R. S. Booth +5
We present a detailed multi-epoch analysis of 31 potential southern hemisphere radio calibrators that were originally observed as part of a program to maintain the International Ce…